Evoke
®
SCS System Clinical Manual
CLIN-UMAN-005175
Revision: 9.00
Page 86 of 101
Issue
Possible Explanation
Corrective Action
Clipping causes
stimulation to stop.
Recording Electrode is
disconnected.
Check electrode connectivity with an
impedance check.
Input to amplifier is too
large.
Switch to low gain mode.
Check the impedances and the
connections to the stimulator if using
an eCLS.
Charging has been started
while the stimulator is
operating with CL enabled.
Restart stimulation.
Current at Maximum. Maximum current limit
may be too low.
If the patient does not report any
surges in stimulation and only cutting
out, increase the maximum current
limit.
High artifact.
Check the activation plot, if it is not
the correct shape try changing
recording or reference electrodes.
Increase pulse width to reduce
current requirement.
Electrode disconnection.
Check the impedances. See ‘Electrode
Disconnected’.
CL stimulation is on when
charging is started.
Turn off the Charger and see if the
problem persists.
Out of Compliance.
Voltage limit may be too
low.
Confirm voltage limit is set to 15 V
(maximum).
Required voltage exceeds
system limits.
Increase pulse width to reduce
current requirement.
Electrode impedance may
be too high.
Check impedances and, if high, select
a different stimulating electrode if
possible.
Add more return electrodes.
CL stimulation is not
working as intended.
Check the activation plot, it should be
linear and increasing. If it is not, try
changing recording or reference
electrodes.
Download logs
failure.
Download of log file has
failed.
Repeat download of log file.
Electrode
disconnected.
Electrode may be broken,
or in highly resistive tissue.
Reprogram using a different
electrode.
Electrode may be
disconnected from
intraoperative cable, lead
adapter or stimulator.
Remove the proximal connector end
from the intraoperative cable, lead
adapter (or CLS if permanent implant
procedure), clean the contacts and re-
insert.
